Съдържание

APhO 2001, Експеримент — Задача 5. Question (5)

Оригинал на условието (PDF)Съобщи за грешка

Всички материали от APhO 2001

2nd Asian Physics Olympiad — TAIPEI, TAIWAN — Experimental Competition — Thursday, April 26, 2001 · 26 април 2001 г. · 3 т.

Read This First

Time Available : 5 hours

Read This First:

Use only the pen provided.
Use only the front side of the answer sheets and paper.
In your answers please use as little text as possible ; express yourself primarily in equations, numbers and figures. If the required result is a numerical number, underline your final result with a wavy line.
Write on the blank sheets of paper the results of all your measurements and whatever else you consider is required for the solution of the question and that you wish to be marked.
It is absolutely essential that you enter in the boxes at the top of each sheet of paper used your Country and your student number (Student No.). In addition, on the blank sheets of paper used for each question, you should enter the number of the question (Question No.), the Section label, the progressive number of each sheet (Page No.) and the total number of blank sheets that you have used and wish to be marked for each question (Total No. of pages). If you use some blank sheets of paper for notes that you do not wish to be marked, put a large cross through the whole sheet and do not include them in your numbering.
At the end of the exam please put your answer sheets and graphs in order.

Условие

Find the wavelength response of the solar cell.

a. Measure and plot the $I_{sc}$ vs. different cut-off wavelengths using the three optical filters.

b. Estimate the longest wavelength for which the solar cell can function properly.

c. Infer which semiconductor material the solar cell is made of. (Hint: the band gaps for commonly used semiconductors are InAs: 0.36 eV, Ge: 0.67 eV, Si: 1.1 eV, amorphous Si(a-Si : H): 1.7 eV, GaN: 3.5 eV)

Отговори

Решение

(5) (Question (5) : 3.0 points)

Find the wavelength response of solar cell under different irradiance.

a. Measure and plot the $I_{sc}$ vs. different cut-off wavelengths using the three optical filters.

$\mathcal{I}/\mathcal{I}_0$	Red: $I_{sc}$ (mA)	Orange: $I_{sc}$ (mA)	Yellow: $I_{sc}$ (mA)
1	×××	×××	×××
0.93
0.75

Graph of Isc (mA, 0–0.6) versus Wavelength (400–800 nm) for three relative intensities: straight lines through the points at the yellow, orange and red cut-off wavelengths, extrapolated to zero current; legend 'I/I0 = 1, λ0 = 740 nm (1.68 eV)' (squares), 'I/I0 = 0.93, λ0 = 732 nm (1.69 eV)' (circles), 'I/I0 = 0.75, λ0 = 742 nm (1.67 eV)' (triangles).

⊙Correct measurement of the short – circuit current of the solar cell under different optical filters and illuminating intensities (1.5 points)

b. Estimate the longest wavelength for which the solar cell can function properly.

⊙Correctly analyzing the longest response wavelength (1 point) (730 ~770 nm)

⊙Correctly inferring the semiconductor material that the solar cell is made of (0.5 points) (a-Si : H)

Оригинал в Архива: exp.pdf · официални решения: exp_sol.pdf